6a) x=4
p=(4+1)*(2*4+11)*(3*4-7)
p= 5*19*5=95*5=495
6b) y=9
p=(9+5)*(2*9-4)*(3*9+3)=14*14*30=196*30=5880
7)In prima zi 19 km
In ziua 2: 19*4=76 km
In ziua 3: 76+19=95km
La finalul celei de-a 3-a zi a ajuns la: 95-11=84 km
In ziua a 4-a parcurg 84*5=420 km
In total parcurge 84+420=504 km
8) 12 lei penar gol
9p=9*5=45 lei
5c=5*3=15 lei
2r=2*2=4 lei
1a= 7 lei
Total: 12+45+15+4+7=83 lei
9) 9<x<17
11<y<22
x poate fi: 10,11,12,13,14,15,16 iar y poate fi 12,13,14,15,16,17,18,19,20,21
minim x*y=10*12=120
maxim x*y=16*21=336
